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Finding the Fourth Proportional to 139,118.26, 208,689.90 and 39,279.46

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Solution

The fourth proportional to 139,118.26, 208,689.90 and 39,279.46 is: 58,922.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,118.26 : 208,689.90 = 39,279.46 : x
  2. Step 2: Convert to fraction form
    139,118.26/208,689.90 = 39,279.46/x
  3. Step 3: Cross multiply
    139,118.26x = 208,689.90 × 39,279.46
  4. Step 4: Simplify right side
    139,118.26x = 8,197,226,579.45
  5. Step 5: Solve for x
    x = 8,197,226,579.45/139,118.26
  6. Step 6: Final answer
    x = 58,922.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.